<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 所有的数字全为真 0为假 所有字符串全为真 ''为假 ，其他都为假


        console.log(Boolean(  '' ));
        
    </script>
</body>
</html>